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1 Contaminated water causes approximately 80% of infection diseases in the world.
2 Today we need alternative source of energy
3 Governments generally warn the public before major health outbreaks occur.

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acid rains, tropical rainforest, exhaust pollution, exhaust fumes, ozone layer, nuclear energy, traffic jams, natural pollution, natural resources, air gases, greenhouse effect, solar enegry, public transport, renewable resources
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1 - b, 2 - f, 3 - h, 5 - c, 6 - g, 7 - a, 8 - i, 9 - e
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1 changes 2 polar 3 habitat 4 recent 5 currently 6 spills 7 pollution 8 creatures 9 warming 10 conditions 11 reports 12 destruction 13 enormous 14 planet